It's currently not possible to create a user with the firebase admin sdk (or any other way outside of firebase UI) and have that user use email/link authentication. It seems that if you want to use email/link, you are forced to enable client registration (setAllowNewAccounts(true)), which is not always desirable.
I traced the code and the issue is that an externally created user always is created with a password provider id. This causes issues in com.firebase.ui.auth.util.data.ProviderUtils#fetchSortedProviders, which ends up throwing a developer error.
This is related to #1735 but there it was mentioned something slightly different: once you enable email/link, previous users with email/password won't be able to log in, meaning to use email/link, ALL users must use it, which looks like a design decision that requires a new feature to be improved. The situation here looks to me more like a bug: a completely new user that has never logged in cannot login at all, even if it is the first user in a blank auth db or all the users were created after enabling email/link auth. Also, the fact that the application accepts an invalid configuration (setAllowNewAccounts(false) with .enableEmailLinkSignIn(), which will never work together) also makes it look more like a corner-case bug
List<AuthUI.IdpConfig> providers = getAvailableProviders();
Intent loginIntent = AuthUI.getInstance()
.createSignInIntentBuilder()
.setAvailableProviders(providers)
.build();
startActivityForResult(loginIntent, LOG_IN_REQUEST_CODE);
private List<AuthUI.IdpConfig> getAvailableProviders() {
ActionCodeSettings actionCodeSettings = ActionCodeSettings.newBuilder()
.setAndroidPackageName(BuildConfig.APPLICATION_ID, true, null)
.setIOSBundleId(iOsBundleId)
.setHandleCodeInApp(true)
.setUrl("https://foo")
.build();
return Collections.singletonList(
new EmailBuilder()
.setAllowNewAccounts(false)
.enableEmailLinkSignIn()
.setActionCodeSettings(actionCodeSettings)
.build());
}
Finally, all this worked fine if using pure firebase-auth: you can create a user externally and log it in using email/link
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