Google Analytics no longer gives out Universal Analytics Ids but Measurement Ids instead. I cant track my site using GA because the new Measurement ID format is different from the UA format and itch rejects it.

 How soon will itch.io update it's setting area to accept the GA's new Measurement IDs?

References:
https://support.google.com/analytics/answer/9539598?hl=en

+1 as I am also facing this issue. We can’t create properties with the old format anymore, and I don’t want to reuse other older existing properties which are unrelated.

Yes It is same, We can not track with new code