Smartsheet not allowing users in Team to access

Our organisation uses Teams and Smartsheets heavily. We share Smartsheets internally and with clients on a regular basis. I am currently trying to share a smartsheet and allow editing (to only internal users). When created integration I ticked Editable by all.

I initially just linked to teams, then added unique users etc but keep coming up with various errors. Example below.

Any ideas why I am unable to share?

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