2 corrected spelling
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May be you shoul try to add first star fromstart after boot, like this:

[Timer] OnBootSec=15min OnUnitActiveSec=2m

May be you shoul try to add first star from boot like this:

[Timer] OnBootSec=15min OnUnitActiveSec=2m

May be you shoul try to add first start after boot, like this:

[Timer] OnBootSec=15min OnUnitActiveSec=2m

1
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May be you shoul try to add first star from boot like this:

[Timer] OnBootSec=15min OnUnitActiveSec=2m