When attempting to create a user mapping for Guest users in GCC High, mapping of these users fails with error:
'The specified user i:0#.f|membership|user_guestdomain.mil#EXT#@tenantname.onmicrosoft.us could not be found'
The user in question in both the mapping file and in the error message is listed as a valid guest user in AAD.
- Modify this policy from the Active Sites tab of the SharePoint Admin Portal.
- Steps available here: Change the sharing settings for a site
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