Site is not access by Extranet user (User not in directory)

Hi Rjj,

As there are some similar threads indicate that the same error message will appear if the account the user sign in to the site with is not same as the one receives email invitation, we’d like to confirm if you are in the same situation.

Please refer to We're sorry, but ... can't be found in the ...sharepoint.com directory. Please try again later, while we try to automatically fix this for you and User not in directory.

If yes, please refer to the suggestion Ran provided in this thread:  We're sorry, but ... can't be found in the ...sharepoint.com directory. Please try again later, while we try to automatically fix this for you.

First, please go to the following location to check if the user’s account is listed there. If yes, please remove it from these locations, then assign permission to see if it works.

• Remove the external user from the active users list in the portal.

1. Go to Office 365 portal -> Users -> Active Users
2. In the user list, find the external user account. It looks like abc_xyz.com#EXT#@tenantname.onmicrosoft.com
3. Delete the user.

• Remove the external user from the UserInfo list.

1. Navigate to the site, edit the URL by adding the following string to the end of it:
   _layouts/15/people.aspx/membershipGroupId=0
   For example, the full URL will resemble the following:
   https://<contoso>.sharepoint.com/_layouts/15/people.aspx/membershipGroupId=0
2. Select the user’s account from the list.
3. Actions -> remove selected users from this SharePoint group.

•  Remove the external user account from the site.

1. Download and install the SharePoint Online Management Shell. For more information, go to the following Microsoft website:
   Introduction to the SharePoint Online Management Shell
2. Run SharePoint Online Management Shell as administrator.
3. Type the following cmdlet:
   $cred = Get-Credential
4. In the Windows PowerShell Credential required dialog box, type your admin account and password, and then click OK.
5. Connect to SharePoint Online, and then type the following cmdlet:
   Connect-SPOService -Url https://tenantname-admin.sharepoint.com -Credential $cred
6. Remove the user from each site collection. Type the following cmdlet, and then press Enter:
   $ExtUser = Get-SPOExternalUser -filter abc_xyz.com#EXT#@tenantname.onmicrosoft.com
   Note: In this cmdlet, replace abc_xyz.com#EXT#@tenantname.onmicrosoft.com with the affected account. Then, to remove the user, type the following cmdlet, and then press Enter:
   Remove-SPOExternalUser -UniqueIDs @($ExtUser.UniqueId)

In addition, we can go to https://tenantname-admin.sharepoint.com/_layouts/15/online/ExternalSharing.aspx to select External users must accept sharing invitations using the same account that the invitations were sent to option to avoid same issue.

Regards,