PayPal - (login) Invalid return invalid client_id or redirect_uri

I've tried almost everything, I can't count the number of times I've checked everything to make sure all the information is correct.

Again and again "Invalid return invalid client_id or redirect_uri".

Please, if someone has already had this problem, tell me how to solve it. I have the impression that the problem is on paypal's side, not mine.

  login.render ({
    "appid":"<My client id>",
    "authend":"sandbox",
    "scopes":"openid profile email address phone https://uri.paypal.com/services/paypalattributes",
    "containerid":"lippButton",
    "responseType":"code",
    "locale":"en-us",
    "buttonType":"LWP",
    "buttonShape":"pill",
    "buttonSize":"lg",
    "fullPage":"true",
    "returnurl":"https://easyclaimstore-dev.myshopify.com/admin/apps/64af2004495b12c144df08b8ebfc2a90/login"
  });