A similar post recently concluded that the bumper cover/panel needs to come off. You can find the factory repair manual here:
https://www.newtis.info/tisv2/a/en/f33-435d-xdrive-cab/
Check section 51. Good luck!
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2015 BMW 228i in EstorilBlau II Metallic / Terra Dakota Leather - 6-speed manual, M Sport Package, Cold Weather Package, Lighting Package, Premium Package, Harman Kardon premium sound, Anti-theft alarm system, Blue Metallic Matt Accent Moldings, Aluminum Hexagon Interior Strips, Anthracite Headlining