Your web server is not properly set up to resolve "/ocm-provider/"

I had the same problem. I suppose you are running nextcloud in a subdirectory of webroot (like I am)?

If yes: adding these lines to your nginx configuration right after the location blocks with the /.well-known/[...] redirects made the warning in the admin page disappear (replace [NEXTCLOUD] with the subdirectory where nextcloud resides):

location ~ /(ocm-provider|ocs-provider)/ {
    return 301 $scheme://$host/[NEXTCLOUD]/$1/;
}

Don’t forget to tell nginx to reload the changed configuration afterwards with:
nginx -s reload

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