Hi @LaurentG, my comment was not a criticism of your unofficial 9-pie build, but just a hint that my microG ‘pachting’ did not work, although it does work on the official /e/ OS e-12-oreo.
Well, now I’ve made another attempt which was successful.
First of all: I noticed on your build that the function ‘Erease all data (factory reset)’ does not work, i.e. the tap on the button ‘Erase everything’ shows no reaction - the function is not executed.
The starting point was a new fresh installation of your /e/ OS e-0.12-p-20201001-UNOFFICIAL-herolte with the old version microG Services Core version 0.2.10.19420
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I was able to upgrade to the current version microG Services Core version 0.2.12.203315 by manually. So now ‘StopCovid France’ also works on a /e/ OS 9-Pie ROM.