scarlet delta
For some reason, Cloudflare is sending emails that the custom domain of my worker cannot renew TLS
Validate the domain to renew its SSL certificate
Shouldn't it be able to do this on its own, since the record was created by Cloudflare automatically after i deployed using Wrangler
chrome sparrowBOT
blissful trench
Yes, Cloudflare will renew the certificate automatically. The email is telling you that it can't for some reason. Some people seem to get these in error, probably because there was an issue that may have cleared and the certificate has since been issued. They also seem to come out if there is a custom certificate or host certificate in use (due to the way Cloudflare selects the certificate if multiple ones are available) that has had its application removed. On expiry the certificate is usually removed and falls through the Universal SSL. Probably other reasons too.
Check if the certificate you are being presented with (in a browser or using cURL) is ok. Also check the certs in your dashboard...