Error acme: Error 429 in acme

Welcome

[X] Yes, I'm using a binary release within 2 latest releases.
[ ] Yes, I've searched similar issues on GitHub and didn't find any.
[ ] Yes, I've included all information below (version, config, etc).

What did you expect to see?

Error acme: Error 429

What did you see instead?

// overallRequestLimit is the overall number of request per second
// limited on the "new-reg", "new-authz" and "new-cert" endpoints.
// From the documentation the limitation is 20 requests per second,
// but using 20 as value doesn't work but 18 do.
overallRequestLimit = 18

20 did not work ， 18 did not work. 1 did work fine!!! 1 rps did indeed work. 20 did not. 18 did not. 1 did. I didn't test any other number.

I can confirm seeing this issue on staging. Lowering the rate helped, but hopefully letsencrypt fixes the issue quickly

How do you use lego?

Through Terraform ACME provider

Reproduction steps

just run

Version of lego

v4.14.2

Logs

```console Error acme: Error 429 ```

Go environment (if applicable)

```console $ go version && go env v1.19 ```

go-acme / lego

Error acme: Error 429 in acme #2024