Getting API error 500 when uploading a new SSL Certificate


We are getting the following error when renewing an existing SSL certificate using the “Upload Custom SSL Certificate” method:

API Request Failed: POST /api/v4/zones/dbc271166571ab12a75f81488042404b/custom_certificates (500)

We tried both Disabling and Enabling Universal SSL Certificate, but the result is the same

Any help would be very grateful!