The problem comes if your visa is issued while you’re here. That can’t happen, as in it could cause major problems.
You can’t have two visas at once. So if you’re a here as a visitor, you can’t also be on a spouse visa. But the spouse visa is not ‘activated’ until you enter as a spouse. So you’re, in effect, in the UK without any status.
This clearly is not a good thing.
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