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Is there a problem with site collection admin?
Sorry, this site hasn’t been shared with you. This user is added in Site Collection Administrator section of all 4 sites but only 1 site has problem. I have even added site collection admin in User Policy in CA and gave FULL RIGHTS and FULL READ permissions. Did iisreset, restart SQL server and SharePoint timer server but no luck.
What causes a user to be denied access to a site?
This issue most frequently occurs when a user is deleted and re-created with the same user principal name (UPN). The new account is created by using a different Unique ID value. When the user tries to access a site collection or their OneDrive, the user has an incorrect ID.
As a SharePoint Online administrator, sign in to the site collection that was shared with the external user. Select the gear icon for the Settings menu, and then select Site settings. In the Users and Permissions section, select People and groups.
Why is custom script not activated for site collection?
After support from Microsoft had a look, we found that the issue was caused by the fact that the Custom Script was not activated for the Site Collection. In case you are experiencing similar issue in the future, you can use the following steps to resolve it:
Can you access more than one site collection?
Inside those applications are two site collections each. When I log in as site collection administrator I can access all three site collections except one. When I try to access that particular site in browser I get message: Sorry, this site hasn’t been shared with you.
How to solve the issue of user NT authority?
Did iisreset, restart SQL server and SharePoint timer server but no luck. How do I solve this issue? User NT AUTHORITY was missing from user policy of problematic web application (not that it should have any effect because other site collection are working fine in this web application) but still I added this user and noticed that:
Who is missing from user policy of problematic web application?
User NT AUTHORITY was missing from user policy of problematic web application (not that it should have any effect because other site collection are working fine in this web application) but still I added this user and noticed that: In problematic web application it appears as i:0#.w|NT AUTHORITY
What to do if you do not have permission to access a site?
The type of permissions the user has on a site and which security group it is derived from (if applicable) will be displayed. If the user does not have appropriate permissions, grant them permissions to the file or site. If the user continues to receive an error message, remove them from the site using the following steps:
If you can’t access the site as the incorrect external user, follow these steps: As a SharePoint Online administrator, sign in to the site collection that was shared with the external user. Select the gear icon for the Settings menu, and then select Site settings.