What are the requirements and procedures for the 90-day reporting in Thailand after moving provinces?

That all sounds double Dutch.

I hope they will abolish this absurd 90day report bs soon!

Getting a certificate of residence from an immigration office has absolutely nothing to do with your need to report every 90 days. You could in theory go every day to an office and request a certificate, but you’ll still need to report your 90 days within the time frame allowed.

Getting a COR does not change the date that you need to report. You need to do so 90 days from within entry to Thailand or 90 days from your last report.

The only things that may “adjust” the date needed for a 90 day report is that you’ve left Thailand and re-entered so from which it resets the report need or that you’ve got a brand new extension off a visa such as a new non O.

Getting an extension off an extension does not change the reporting date required. If you got a new year extension yesterday, and your 90 day report is due tomorrow then you’ll need to report then. Some offices will take that in to account and give you a new slip in your passport but some won’t.

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The certificate of residency has nothing to do with when you must do your 90 day report. That is based on when you entered Thailand. Applying for and getting a certificate of residency does not restart the 90 day count.

Your first 90 day after moving province must be done in person...

There's only 2 ways to satisfy the 90 day report requirement.

1) file an on-time 90 day report.

2) leave the country before it's been 90 days since your last report.

NOTHING else counts as a 90 day report and resets the timer. Not even an extension (though sometimes they will file a new 90 day report for you when you do an extension and they'll give you a new 90 day report slip).