I don't know if this is possible, but I just want to link my other Xbox account instead of the one I have now without having to wait 3 months to do it. I just got my own PC and I want to sort this out as quickly as possible, if it is possible.
The reservation in the waiting room has been approved and validated. You can sort this issue out in 90 days time. Hopefully you haven't purchased silver on the linked accounts or that constitutes a 90 day wait of it's own.