Well the steps can be different on Los 18.1 because Signature spoofing is not built in to Los but it is on Crdroid which makes it was less of a pain because you don't need Xposed for things to work correctly.
So starting with Crdroid go about your normal setup and install Magisk per normal. Afterwards you're going to need to select a package from
this link normally minimalAP or the Standard package should be just fine. These packages have everything you need to get MicroG working with the Google Play store the only difference between minimal is Aurora Services and the location backends which a tablet doesn't necessarily need but it depends on what you use it for.
After flashing this through recovery follow these steps..
Initial Setup:
- Complete the setup wizard actions as you prefer
- Open the app drawer and long-press on Play Store to choose the App Info button
- Go to Permissions, then Additional permissions and change Spoof package signature to Allow, go back to home screen afterward
- Run the microG Settings app — The rest of these instructions are taken almost directly from
https://gitlab.com/Nanolx/NanoDroid/-/blob/master/doc/microGsetup.md
- Choose Self-Check at the top of the list, and start tapping on the second item, System grants signature spoofing permission which should prompt a permission request
- Everything should now be checked on the Self-Check screen, go back to main microG Settings screen
- Choose Google device registration and enable the Register device switch, then go back
- Choose Cloud Messaging and enable the Receive push notifications switch, then go back
- SafetyNet doesn't actually work or pass right now, but you can try enabling it in the same manner as above
- Choose Location modules and enable at least one "Network-based Geolocation module" and one "Address lookup module". I usually only turn on Deja Vu Location Service from the top list; it seems to work well enough for driving directions here, and of course choose Nominatim from the lower list because it's the only one there
- This is important: Reboot now before you add a Google account or do anything else to the Play Store app
- After rebooting, go back into microG Settings app and make sure that all of the Self-Check items are still checked, and then make sure that Google Device Registration, Cloud Messaging, and SafetyNet are still enabled — if they were not, enable them.
- Now get app info for Play Store, clear cache (yes, again), then launch the app
- Add your Google account, and verify that it will show your app library — Purchased apps won't show as paid-for yet, this will take approximately 24 hours until Google decides it likes your new Android ID
- Open Settings app, then Accounts then choose your Google account, then chose Personal info & privacy, and make sure Allow apps to find accounts is enabled
- That should be everything!
Then after a few hours (a day or so) you should have complete access to you paid apps and you're good to go. Let me know if you need anything else!