{"id":17304,"date":"2026-07-14T20:02:11","date_gmt":"2026-07-14T11:02:11","guid":{"rendered":"https:\/\/m365jp.net\/?p=17304"},"modified":"2026-07-14T20:06:31","modified_gmt":"2026-07-14T11:06:31","slug":"servicerestored-ex1427120-exchange-online-some-users-were-unable-to-see-conference-room-availability-for-exchange-online-through-a-room-booking-application","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-07-14-servicerestored-ex1427120-exchange-online-some-users-were-unable-to-see-conference-room-availability-for-exchange-online-through-a-room-booking-application","title":{"rendered":"[serviceRestored] EX1427120 | Exchange Online | Some users were unable to see conference room availability for Exchange Online through a room-booking application"},"content":{"rendered":"
\n
\n
\n\n\n\n
EX1427120 | Exchange Online | Some users were unable to see conference room availability for Exchange Online through a room-booking application<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n\n\n\n\n\n\n\n\n\n
Status<\/th>\nserviceRestored<\/td>\n<\/tr>\n
Classification<\/th>\nadvisory<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers were unable to see conference room availability for Exchange Online through a room-booking application. <\/td>\n<\/tr>\n
Last Updated<\/th>\n07\/14\/2026 10:24:31<\/td>\n<\/tr>\n
Start Time<\/th>\n07\/13\/2026 09:00:00<\/td>\n<\/tr>\n
End Time<\/th>\n07\/14\/2026 10:22:42<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Some users were unable to see conference room availability for Exchange Online through a room-booking application <\/p>\n

User impact: Users were unable to see conference room availability for Exchange Online through a room-booking application. <\/p>\n

More info: Affected users may have received HTTP 403 Forbidden errors when attempting to retrieve room mailbox availability data, which prevented meeting room availability lookups, booking, and scheduling operations. <\/p>\n

Final status: We’ve completed the reversion of the aforementioned change and confirmed after an extended period of monitoring that impact has now been remediated. <\/p>\n

Scope of impact: Impact was specific to some users attempting to see conference room availability for Exchange Online through the affected third-party room-booking application. <\/p>\n

Start time: Monday, July 13, 2026, at 9:00 PM UTC <\/p>\n

End time: Tuesday, July 14, 2026, at 8:29 AM UTC <\/p>\n

Root cause: A recently enabled service change affected how free\/busy request tokens were processed, resulting in HTTP 403 errors when users attempted to retrieve conference room mailbox availability information. <\/p>\n

Next steps:
– We’re reviewing our service change validation procedures to better identify similar issues during our development and testing cycles. <\/p>\n

This is the final update for the event.<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb:\u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u306f\u30eb\u30fc\u30e0\u30d6\u30c3\u30ad\u30f3\u30b0\u30a2\u30d7\u30ea\u3067Exchange Online\u306e\u4f1a\u8b70\u5ba4\u306e\u7a7a\u304d\u3092\u78ba\u8a8d\u3057\u3089\u308c\u307e\u305b\u3093\u3067\u3057\u305f <\/p>\n

\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff:\u30e6\u30fc\u30b6\u30fc\u306f\u30eb\u30fc\u30e0\u30d6\u30c3\u30ad\u30f3\u30b0\u30a2\u30d7\u30ea\u3092\u901a\u3058\u3066Exchange Online\u306e\u4f1a\u8b70\u5ba4\u306e\u7a7a\u304d\u72b6\u6cc1\u3092\u78ba\u8a8d\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002 <\/p>\n

\u8a73\u7d30\u60c5\u5831:\u5f71\u97ff\u3092\u53d7\u3051\u305f\u30e6\u30fc\u30b6\u30fc\u306f\u3001\u90e8\u5c4b\u306e\u90f5\u4fbf\u30dc\u30c3\u30af\u30b9\u306e\u7a7a\u304d\u72b6\u6cc1\u30c7\u30fc\u30bf\u53d6\u5f97\u3092\u8a66\u307f\u305f\u969b\u306bHTTP 403\u7981\u6b62\u30a8\u30e9\u30fc\u3092\u53d7\u3051\u3001\u4f1a\u8b70\u5ba4\u306e\u7a7a\u304d\u72b6\u6cc1\u306e\u78ba\u8a8d\u3001\u4e88\u7d04\u3001\u30b9\u30b1\u30b8\u30e5\u30fc\u30ea\u30f3\u30b0\u64cd\u4f5c\u304c\u59a8\u3052\u3089\u308c\u305f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002 <\/p>\n

\u6700\u7d42\u72b6\u6cc1:\u524d\u8ff0\u306e\u5909\u66f4\u306e\u30ea\u30d0\u30fc\u30c8\u3092\u5b8c\u4e86\u3057\u3001\u9577\u671f\u9593\u306e\u76e3\u8996\u306e\u672b\u3001\u5f71\u97ff\u304c\u306f\u3063\u304d\u308a\u3057\u305f\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002 <\/p>\n

\u5f71\u97ff\u7bc4\u56f2:\u5f71\u97ff\u306f\u3001\u5f71\u97ff\u3092\u53d7\u3051\u305f\u7b2c\u4e09\u8005\u30eb\u30fc\u30e0\u30d6\u30c3\u30ad\u30f3\u30b0\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u901a\u3058\u3066Exchange Online\u306e\u4f1a\u8b70\u5ba4\u306e\u7a7a\u304d\u72b6\u6cc1\u3092\u78ba\u8a8d\u3057\u3088\u3046\u3068\u3059\u308b\u4e00\u90e8\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u7279\u5316\u3057\u307e\u3057\u305f\u3002 <\/p>\n

\u958b\u59cb\u6642\u523b:2026\u5e747\u670813\u65e5(\u6708)\u5348\u5f8c9\u6642(UTC) <\/p>\n

\u7d42\u4e86\u6642\u523b:2026\u5e747\u670814\u65e5\u706b\u66dc\u65e5 \u5348\u524d8\u664229\u5206 UTC <\/p>\n

\u6839\u672c\u539f\u56e0:\u6700\u8fd1\u6709\u52b9\u306b\u306a\u3063\u305f\u30b5\u30fc\u30d3\u30b9\u5909\u66f4\u306b\u3088\u308a\u3001\u7a7a\u304d\u30fb\u5fd9\u3057\u3044\u30ea\u30af\u30a8\u30b9\u30c8\u30c8\u30fc\u30af\u30f3\u306e\u51e6\u7406\u65b9\u6cd5\u304c\u5909\u308f\u308a\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u4f1a\u8b70\u5ba4\u306e\u30e1\u30fc\u30eb\u30dc\u30c3\u30af\u30b9\u306e\u7a7a\u304d\u60c5\u5831\u3092\u53d6\u5f97\u3057\u3088\u3046\u3068\u3057\u305f\u969b\u306bHTTP 403\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f\u3002 <\/p>\n

\u6b21\u306e\u30b9\u30c6\u30c3\u30d7:
– \u958b\u767a\u304a\u3088\u3073\u30c6\u30b9\u30c8\u30b5\u30a4\u30af\u30eb\u4e2d\u306b\u985e\u4f3c\u306e\u554f\u984c\u3092\u3088\u308a\u660e\u78ba\u306b\u7279\u5b9a\u3059\u308b\u305f\u3081\u3001\u30b5\u30fc\u30d3\u30b9\u5909\u66f4\u306e\u691c\u8a3c\u624b\u9806\u3092\u898b\u76f4\u3057\u3066\u3044\u307e\u3059\u3002 <\/p>\n

\u3053\u308c\u304c\u30a4\u30d9\u30f3\u30c8\u306e\u6700\u7d42\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3067\u3059\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

EX1427120 | Exchange Online | Some users were unable to see conference room availability for Exchange Online t […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-17304","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/17304","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/comments?post=17304"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/17304\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=17304"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=17304"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=17304"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}