Just arrived yesterday from the US on 90 day non-O supposed to be for marriage.  Bangkok Immigration just stamped it for 90 days to Dec 1st and reason was just Non Imm-O.  No marriage or retired.  I brought it to her attention and she argued that it would be fine. Can I get this fixed at the Udon Thani Immigration?  My Visa application was for visiting Thai family for over 60 days and it states that.
TLDR : Answer Summary
The user has recently arrived in Thailand on a 90-day NON-O visa intended for marriage but has received a stamp that only indicates 'Non Imm-O'. They are inquiring if this issue can be resolved at Udon Thani Immigration. Comments clarify that the stamp received is correct for the visa type issued, and no immediate action is required, as the visa application reflects the intended purpose.
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