Disable guest accounts from showing in "Check Names" pop-up

Occasional Visitor

Some users within the organization have a licensed Microsoft account and a guest account for a custom app integration. When sending an email to users with double accounts, the "Check Names" dialog box pops up to confirm which user to send the mail to.

 

Is there a way to disable the guest accounts from showing in the "Check Names" pop-up?

 

Check names guest account.png

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