CardDav sync HTTP 502 Bad Gateway

CardDav sync HTTP 502 Bad Gateway

Carddav syncing is not working for me.
I don't know if it's a coincidence but it is possible that problems have started when I added a new contact in my phone with only a last name and a phone number. I know that contacts should have first name or e-mail but i made a mistake this time.

Now, when I try to sync contacts on my Android phone using DAVx5 there is an error: "HTTP server error - HTTP 502 Bad Gateaway".
I tried to install PeopleSync CardDAV Client and set it up according to the
knowledge base and it's giving me the same error.
EmClient on my Windows Computer is giving me "[CardDAV] Sync of Zoho contacts/default failed due to the following error: Zoho contacts (Bad Gateway)".

Is it possible that I broke syncing by a bad contact and is there any way to repair it? I have tried to delete contacts in my phone even reset (delete) contacts in Zoho but it didn't help.



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