When you get this error message "You can not grant edit access to the guest user" it means that this person has not agreed to join your workspace yet, so he is still a guest.
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Please give them your invite link and tell them to complete it: https://dashboard.formaloo.com/u/members
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They need to:
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1. Sign up to Formaloo
2. Then click on the invite link to Join your workspace. Accept it and click continue.