Additional meeting and call-related features and issues within Microsoft Teams for business
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You can use PowerShell to get a list of all the guest users in your tenant and extract their domains. Then you can compare the domains with the current external access configuration for Teams and find out which ones are not already included.
'Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.'
https://practical365.com/teams-external-access-powershell/
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