Hello @Britney_Edwards This appears to be a bug - it's the topic of other past conversations in this community and you may want to read the solutions offered: https://gorovian.000webhostapp.com/?exam=t5/microsoft-teams/teams-chat-error-quot-administrator-has-disab...
This was also the topic on our answers.microsoft.com tech support site last year: https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_teams-mso_o365b/administra...
Hope these help.
