Hello
I’m Adeyemi and I’d be happy to help you with your question.
The issue of team members not showing up in Microsoft Teams could be due to several reasons.
One possibility is that there might be a delay in syncing the members list, especially if the members were added recently. You can try checking the Teams Admin Center to see if all the members are visible there. To do this, open Teams Admin Center > Teams > Manage Teams > Search for your affected Office 365 group and click on edit settings to view the members list.
Another possibility is that there might be an issue with the Teams app itself. You can try clearing the cache and credential manager cache². To do this, fully exit the Microsoft Teams desktop client, go to File Explorer, and type in %appdata%\Microsoft\teams. From within 'Application Cache', go to Cache and delete any of the files in the Cache location.
I hope this helps.
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Kind regards,
Adeyemi