Rate Limit Exceeded for CardDAV connections

We've been supporting iCloud CardDAV contacting syncing for over 8 years. Never once had a problem before, but past week or so we've had numerous reports from users where they're seeing "Rate Limit Exceeded" errors coming from iCloud.

What are these limits? How can developers request for an increase (where users genuinely import hundreds of new contacts daily)? Google contacts, for instance, allows developers to apply for an increase. There seems to be nothing in relation to this in the documentation. We have no clue what these limits even are.

Post not yet marked as solved Up vote post of Smithers Down vote post of Smithers
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  • I can confirm this. We've been getting unspecified errors for some customers recently, and now they turned into 503 "Rate Limit Exceeded".

  • Any updates on this? Are you still experiencing the issue?

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also seeing this error. would be helpful for Apple to publish rate limits for CardDav and CalDav servers

device <> icloud sync seems to be slower as well.