Impossible to connect to Self-Hosted Matomo


I configured the plugin " WP-Matomo Integration (WP-Piwik)" on a Wordpress Website for connecting it to a self Hosted Matomo. But it doesn’t want to connect to it (cf. image)

I launched the test script and i have this error “429 Too Many Requests” :

Test 2/3: SitesManager.getSitesWithAtLeastViewAccess


array(2) {
string(203) "HTTP/1.1 429 Too Many Requests
Date: Tue, 04 Jan 2022 10:37:16 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Accept-Encoding
Server: o2switch-PowerBoost-v3

I don’t how to solve the problem. Can you help me ?