Hmm, maybe is worth to open a bug report with your solution as there was another report with this a few days ago IIRC. It might help devs to debug.
Thanks @phovi, that solved it for me. I was also suffering from this problem all the time, unless I read your post and found out that this switch was indeed off on my phone as well. Just had to switch it on, now I finally have mobile internet in AAS 
Strange. Mobile data for AAS worked flawlessly for me for the last two releases or even more.
I had my test SIM in the second slot. Disabled. I don’t know when exactly my issues with mobile data in AAS began as I don’t often need that but I suspect it started when I removed the disabled SIM and not the 5.0.0.67 upgrade. As that happened almost simultanously.
I notice that AAS had no data on the road yesterday. I checked the AAS settings and the SIM was disabled. Then I used the mentioned double disable/enable procedure. SIM was then enabled but the Data was not. Also 3G was set which is turned off for a year and a half here. So I enabled LTE too. After restart SIM was enabled in AAS but the data was off and 3G was again set.
Need to test more.
BTW thx for the mentioned workarounds!
- 0.67 android apps cant connect to internet
Whatsapo often yes butthe rest no: aurora, tidal… nope
My sim-card settings are completly disabled. How can I activate it in the android settings?
You can’t do it there. Workarounds are mentioned in the Release notes:
It seems that the issue in my case is autostart of AAS.
Manual start works have mobile data in Andy apps always for now.
Now I have another problem: WIFI is not working with AAS anymore.
The internet connection settings of AAS (after tipping 5x on the AAS version in the settings) report that it is connected via mobile data to my carrier (congstar Germany in my case), even when the device is connected to a WIFI. Then, when I switch off mobile data in the top menu or via the SFOS settings, all android apps report that there is no internet connection.
In the connection settings of AAS it has a greyed out “Internet settings” with a question mark. And when I tip on that, it tells me that I “don’t have permissions to change WLAN settings”
After this experiment it is not enough to switch on the mobile data again in the upper menu. It wont find a connection until I switch off WIFI… only then it connects to the carrier. Afterwards I can switch on WIFI again and mobile internet stays connected. But I need to restart AAS in order to propagate this - and usually I also need to switch on the “mobile data” setting again in the SIM card settings of AAS.
It is really annoying. Needless to say that all android apps use mobile data now, even when I am connected to a WIFI.
Funny thing though: android apps can access IPs inside the connected WIFI, if it is the first in the connection list. For instance I can access the IP of my fritz box from Fennec just fine, when I am connected to my home WLAN, which is the first in my list. But of course the http://fritz.box address, which usually resolves to this IP, does not work.