Rate limited IP when trying to mass enable

[jvanasco]

@_az

If you want to fix the problem immediately, you might need to manually issue the missing certificates using non-Plesk tools, and then gradually replace them with Plesk-issued certificates as the account registration limit permits (~7 days for all your 573 users).

Personally, I would use 1 LetsEncrypt account to issue all the certificates and then migrate them to individual accounts over the next few days.

You could also funnel traffic through proxy-servers to hit the LetsEncrypt API from a pool of IP addresses, which should bypass this ratelimit.