MicroG on eOS 0.16-q is still v0.2.17 and Crypto app will not open (same “install in play store” message )
On another device that has MicroG v0.2.18 running on LOS for MicroG 18.1 (Android 11), crypto app not working.
eOS version 0.17 which is currently in testing is reported as having “MicroG specific fixes”, so that may help.
It also looks like in version 0.17 MicroG will be updated to the latest : v0.2.19.211515