{"id":15608,"date":"2026-03-27T05:01:35","date_gmt":"2026-03-26T20:01:35","guid":{"rendered":"https:\/\/m365jp.net\/?p=15608"},"modified":"2026-03-27T05:07:12","modified_gmt":"2026-03-26T20:07:12","slug":"servicedegradation-ex1255397-exchange-online-some-users-may-be-unable-to-access-the-default-add-ins-in-outlook-4","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-03-27-servicedegradation-ex1255397-exchange-online-some-users-may-be-unable-to-access-the-default-add-ins-in-outlook-4","title":{"rendered":"[serviceDegradation] EX1255397 | Exchange Online | Some users may be unable to access the default add-ins in Outlook"},"content":{"rendered":"<div class=\"postie-post\">\n<div>\n<hr>\n<table id=\"section\">\n<tbody>\n<tr>\n<th width=\"95%\">EX1255397 | Exchange Online | Some users may be unable to access the default add-ins in Outlook<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr>\n<table id=\"data\">\n<tbody>\n<tr>\n<th>Status<\/th>\n<td class=\"bad\">serviceDegradation<\/td>\n<\/tr>\n<tr>\n<th>Classification<\/th>\n<td>advisory<\/td>\n<\/tr>\n<tr>\n<th>User Impact<\/th>\n<td>Users may be unable to access the default add-ins in Outlook.<\/td>\n<\/tr>\n<tr>\n<th>Last Updated<\/th>\n<td>03\/26\/2026 19:52:01<\/td>\n<\/tr>\n<tr>\n<th>Start Time<\/th>\n<td>03\/18\/2026 21:53:53<\/td>\n<\/tr>\n<tr>\n<th>End Time<\/th>\n<td><\/td>\n<\/tr>\n<tr>\n<th>Latest Message<\/th>\n<td>Title: Some users may be unable to access the default add-ins in Outlook<\/p>\n<p>  User impact: Users may be unable to access the default add-ins in Outlook.<\/p>\n<p>  More info: This issue impacts both the Outlook desktop client and Outlook on the web. Some affected users find that the \u201cMy Templates\u201d icon is missing from the Outlook ribbon and others may be unable to find templates in the AppData Microsoft Templates location,   even though templates are known to exist and may still be being used by non-impacted users. Some users also report that the Viva Insights add-in is also impacted by this event.<\/p>\n<p>  Current status: We&#8217;ve rolled back changes to the Representational State Transfer (REST) API for some users and confirmed that this addressed the default add-in issue with those affected users. We&#8217;re rolling back this change for all impacted users and are monitoring   as it saturates to confirm that impact is completely remediated.<\/p>\n<p>  Scope of impact: Some users attempting to access or use the default add-ins within Outlook may be impacted. This information may be updated as our investigation continues.<\/p>\n<p>  Root cause: A recent REST API update prevents users from accessing default add-ins in Outlook.<\/p>\n<p>  Next update by: Friday, March 27, 2026, at 9:00 PM UTC<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>EX1255397 | Exchange Online | Some users may be unable to access the default add-ins in Outlook Status service [&hellip;]<\/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-15608","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15608","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=15608"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15608\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=15608"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=15608"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=15608"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}