I am using the SecureGo+ app myself, downloaded from Aurora Store. No problems up to now. FP3, Lineage_MicroG, Android 15.
I locked the bootloader again after installing the Lineage_MicroG OS.
thx for this info @Luftikus 
It might be relevant for this topic that with the latest update for FP3 the unlocking of the bootloader has been simplified
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Indeed it is and I hope Fairphone warned the /e/ foundation about this change to update their documentation.
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While still mentioning the code, Murena’s FP3 command line install guide just links to Fairphone’s (now updated) unlock page, so no problem there, at least.
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