SharePoint online "Check Permission" shows "None" for users added to the MS 365 group (members)

I added 25 users to an (MS 365) group as site members with edit permission.  When sharing links to files, we noticed bounceback from a couple of users, with the system indicating they have no access to the site, even thou they are members of the group.
I removed them from the group and added them again, but the "Check Permission" still indicates 'None' for access.

The only thing in common those users have is that they been away and may have not logged in to SharePoint yet. Any troubleshooting idea will be greatly appreciated.

Thank you and a happy new year