How do I change platform on insider?

the following guide should help you a lot.

https://www.windowscentral.com/minecraft-guide-how-set-xbox-live-cross-play-playstation-4

what game are you trying to play cross platform

Are you a
Bing Insider?

I'd request a software engineer look at this but this Community is their venue. They are not involved with Bing.com just this particular platform.

You can send your findings to binsider @microsoft.com. Remove the space between binsider and @ so the email will go directly to the Bing Team that incorporates changes in the platform. Add the url to this thread in that email for informational purposes to
the team. It's important they hear about it. I'd also advise becoming an insider.

There are pilot teams for possible changes within Bing. They experiment and relate their findings to the team before these changes are implemented.

Hope this helps.

I know how you feel, on pc there is only one other that charges for name changes and thats battlenet, every other platform has either instant free name changes like steam do or timed delayed name changes.

A day passed since the person removed Insider for Xbox through PC, and still I have insider on Xbox. Nothing changed. Do you know how long it would take for me to come back to official branch of updates?