{"id":17340,"date":"2026-07-15T15:01:38","date_gmt":"2026-07-15T06:01:38","guid":{"rendered":"https:\/\/m365jp.net\/?p=17340"},"modified":"2026-07-15T15:04:37","modified_gmt":"2026-07-15T06:04:37","slug":"servicerestored-ex1426934-exchange-online-some-admins-may-be-unable-to-make-changes-to-distribution-lists-in-exchange-online-and-receive-an-error","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-07-15-servicerestored-ex1426934-exchange-online-some-admins-may-be-unable-to-make-changes-to-distribution-lists-in-exchange-online-and-receive-an-error","title":{"rendered":"[serviceRestored] EX1426934 | Exchange Online | Some admins may be unable to make changes to distribution lists in Exchange Online and receive an error"},"content":{"rendered":"<div class=\"postie-post\">\n<div>\n<hr>\n<table id=\"section\">\n<tbody>\n<tr>\n<th width=\"95%\">EX1426934 | Exchange Online | Some admins may be unable to make changes to distribution lists in Exchange Online and receive an error<\/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\">serviceRestored<\/td>\n<\/tr>\n<tr>\n<th>Classification<\/th>\n<td>advisory<\/td>\n<\/tr>\n<tr>\n<th>User Impact<\/th>\n<td>Admins may have been unable to make changes to distribution lists in Exchange Online and received an error.<\/td>\n<\/tr>\n<tr>\n<th>Last Updated<\/th>\n<td>07\/15\/2026 05:34:17<\/td>\n<\/tr>\n<tr>\n<th>Start Time<\/th>\n<td>07\/12\/2026 23:00:00<\/td>\n<\/tr>\n<tr>\n<th>End Time<\/th>\n<td>07\/15\/2026 05:33:30<\/td>\n<\/tr>\n<tr>\n<th>Latest Message<\/th>\n<td>Title: Some admins may be unable to make changes to distribution lists in Exchange Online and receive an error<\/p>\n<p>  User impact: Admins may have been unable to make changes to distribution lists in Exchange Online and received an error.<\/p>\n<p>  More info: Affected admins may have been unable to view, add, remove, or edit users associated with distribution lists in Exchange Online and received the following error message:<\/p>\n<p>  &#8220;You don&#8217;t have permission to access this page or perform this action&#8221;.<\/p>\n<p>  This issue affected both the Exchange admin center and the Microsoft 365 admin center.<\/p>\n<p>  As a workaround, affected admins could\u2019ve used the Exchange Online PowerShell cmdlet \u201cSet-DistributionGroup\u201d to manage distribution lists.<\/p>\n<p>  Current status: We\u2019ve confirmed with affected users that this issue is resolved as a result of our reverting the offending service update.<\/p>\n<p>  Scope of impact: Some admins attempting to modify Exchange Online distribution lists through the Microsoft 365 admin center or Exchange admin center that are served by the affected infrastructure in the West UK, West Europe, India, Southeast Asia, West Japan,   or East Australia regions may have been impacted.<\/p>\n<p>  Start time: Sunday, July 12, 2026, at 11:00 PM UTC<\/p>\n<p>  End time: Wednesday, July 15, 2026, at 1:00 AM UTC<\/p>\n<p>  Root cause: A recent update to distribution list management functionality inadvertently created a configuration conflict within a subset of the service infrastructure, resulting in impact.<\/p>\n<p>  Next steps:<br \/>  &#8211; We\u2019re reviewing our validation and updating procedures to better detect and prevent issues like this prior to deployment in the future.<\/p>\n<p>  This is the final update for the event.<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>EX1426934 | Exchange Online | Some admins may be unable to make changes to distribution lists in Exchange Onli [&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-17340","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/17340","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=17340"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/17340\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=17340"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=17340"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=17340"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}