Issue adding External Vendor to Teams as a Guest

[HCNance]

Good afternoon,

We are attempting to add two guests into a team through Microsoft Teams, and are receiving a "We ran into an issue, please try again later" error message when adding them via their work domain email address. Guest access is enabled for Teams and we can add other Teams without any issues. 

[#2]

Tried to use the web client? You haven’t restricted/ allowed for certain domains? Can you try add a new guest from another domain that hasn’t been invited to any team in your org?

Adam