@Gary **********
No - Not true at all for a Multi-Entry Visa (if the Visa is still valid - not reached the Expiry date) The whole purpose of a Multi-Entry Visa is just that... Example: First year of an O-A Multi-Entry Visa has unlimited Exits and Reentry. Exception for Everyone is under Covid-19 Restrictions the Thai Border is closed. A COE Certificate of Entry must be filed for and obtained. But a COE is Not the same as a reentry permit.