Not able to authenticate using project-api

[KrishnaThali]

I tried to generate a new API key and provided the same as shown below:

token <- anonymous_login(project_api = "new_API_key")

If I try to access token$idToken, I am getting NULL. Please find the content of token below:

$error
$error$code
[1] 400

$error$message
[1] "ADMIN_ONLY_OPERATION"

$error$errors
$error$errors[[1]]
$error$errors[[1]]$message
[1] "ADMIN_ONLY_OPERATION"

$error$errors[[1]]$domain
[1] "global"

$error$errors[[1]]$reason
[1] "invalid"

Can anyone please help me on this?

Thanks!

[KingNob]

You may need to change your authentication rules in your project settings to enable Anonymous login