I was stupid and deleted the old post Having trouble with my Xiaomi Watch 2 Pro, anyone else experiencing the same? : WearOS (reddit.com) by accident...

im for years on this platform but never posted much so sorry for my stupidity.

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The AOD was resetting every sync.

Solution: When the AOD resetted i put it on again in the AOD Option inside the Mi Fit app but did NOT press sync on the same page instead i went to the right

"profile" - > settings -> "sync with cloud"

i found a button to manually sync which seem to have overwritten the faulty setting in the Xiaomi Cloud.

However now the AOD setting gets overwritten only if i sync on the "devices" page. When i sync on "health" or over "profile" the setting is not resetted.

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Edit: If you deactivate the DND Setting, the AOD Setting will Sync. Thanks to u/4otograf