icloud_photos_downloader: pyicloud_ipd.exceptions.PyiCloudAPIResponseError: private db access disabled for this account.

hi. i’m getting alot of those lately: pyicloud_ipd.exceptions.PyiCloudAPIResponseError: private db access disabled for this account. Please wait a few minutes then try again. The remote servers might be trying to throttle requests. (ACCESS_DENIED) with my icloud account. my sons account never gets this error.

i suppose thats because my photo library is much bigger. what is the actual limit of requests? is it per hour? is there any info of how this throttling mechanism works?