I'd image that it's an issue with the mission recording his assignment in their system.
Out of curiosity, is there another missionary serving that has same last name? Perhaps there's some confusion over who is serving where.
I'm not sure how it works on the mission side, but the key to everything tends to be the MRN. The MRN of the assigned missionary has to match the MRN on the Church Account being used to access Member Tools.
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