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Your client does not have permission to get URL /identitytoolkit/v3/relyingparty/createAuthUri from this server

See original GitHub issue

We started to see the following crash quite frequently over the last few weeks:

Fatal Exception: com.google.firebase.FirebaseException: An internal error has occurred. [ <!DOCTYPE html>
<html lang=en>
  <meta charset=utf-8>
  <meta name=viewport content="initial-scale=1, minimum-scale=1, width=device-width">
  <title>Error 403 (Forbidden)!!1</title>
  <style>
    *{margin:0;padding:0}html,code{font:15px/22px arial,sans-serif}html{background:#fff;color:#222;padding:15px}body{margin:7% auto 0;max-width:390px;min-height:180px;padding:30px 0 15px}* > body{background:url(//www.google.com/images/errors/robot.png) 100% 5px no-repeat;padding-right:205px}p{margin:11px 0 22px;overflow:hidden}ins{color:#777;text-decoration:none}a img{border:0}@media screen and (max-width:772px){body{background:none;margin-top:0;max-width:none;padding-right:0}}#logo{background:url(//www.google.com/images/branding/googlelogo/1x/googlelogo_color_150x54dp.png) no-repeat;margin-left:-5px}@media only screen and (min-resolution:192dpi){#logo{background:url(//www.google.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png) no-repeat 0% 0%/100% 100%;-moz-border-image:url(//www.google.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png) 0}}@media only screen and (-webkit-min-device-pixel-ratio:2){#logo{background:url(//www.google.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png) no-repeat;-webkit-background-size:100% 100%}}#logo{display:inline-block;height:54px;width:150px}
  </style>
  <a href=//www.google.com/><span id=logo aria-label=Google></span></a>
  <p><b>403.</b> <ins>That’s an error.</ins>
  <p>Your client does not have permission to get URL <code>/identitytoolkit/v3/relyingparty/createAuthUri</code> from this server.  <ins>That’s all we know.</ins> ]
       at com.google.firebase.auth.api.internal.zzdv.zza(zzdv.java:18)
       at com.google.firebase.auth.api.internal.zzfc.zza(zzfc.java:21)
       at com.google.firebase.auth.api.internal.zzes.zza(zzes.java:34)
       at com.google.firebase.auth.api.internal.zzeu.zza(zzeu.java:74)
       at com.google.firebase.auth.api.internal.zzeb.zza(zzeb.java:18)
       at com.google.android.gms.internal.firebase_auth.zza.onTransact(zza.java:13)
       at android.os.Binder.execTransactInternal(Binder.java:1021)
       at android.os.Binder.execTransact(Binder.java:994)

SDK version: com.google.firebase:firebase-auth:19.2.0

The first crash occured in the build where we introduced Sign in with Apple, but it does not have to be necessarily related. We were not able to reproduce it on any device.