Cant install SSL certificate

Been using Hestia for almost one year, never had a single issue with SSL, all domains setup with Lets Encrypt, everything always worked just fine.
Did not add any new domains, did not make any change in either Hestia or CloudFlare, yet last week started getting:
Error: Let’s Encrypt new auth status 429 (+++domain name+++)

Not only that but at the same time I cant install a CF origin certificate or even a ZeroSSL certificate for a domain.
If I manually try to add the certificate in the domain details page I ALWAYS get:
Error: ssl certificate key pair is not valid (for both CF or ZeroSSL)

What could cause this? Maybe some incompatibility with OpenSSL ? Currently running OpenSSL 1.1.1n-0+deb11u4

System and websites were all using PHP8.1
Moved everything to PHP8.2 (System and Websites) and now everything works again!
Installing certificates work as it should!
Hope this helps someone in the future!

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