Exposure Notification does not work at the moment, because /e/ developers decided to take an extra step of care. Some members of the community distrusted microG’s open source implementation of the API and that it would be disabled until you opt in. So it was decided to make the API an external package, which has to be specifically downloaded.
This is taking some time. Until they have sorted it out, you have to wait or find some build where the standard version of microG is included, which does support the API.
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