Anonymous login failed, try again later!

Yesterday I discovered that I am unable to log in with an anonymous account anymore, I always only get the error message "Anonymous login failed, try again later!".

I have tried with the latest three versions of AuroraStore (3.1.0, 3.1.1 and 3.1.2) and today's nightly (20191003), but always the same.

Tested with the following phones and always with the same result:

• OnePlus 5 with latest LineageOS 16 for microG + Magisk + Bromite System WebView
• OnePlus 6 with latest LineageOS 16 for microG + Magisk + Bromite System WebView
• Lenovo Moto G4 with stock Android 7

At first I thought that this weeks LOS for microG update broke something, but the failed test on the old Moto G4 with stock Android firmware confirmed that that's not the case.

The problem persists, I have tried to log in anonymously on all three devices several times within the last few hours without success.