Dav5x gets 405 error trying to access REPORT /cal/<user>

[MFAshby]

Steps to reproduce:

• start fennel server, add user with fennelcli
• install dav5x on android device, add account using credentials for fennel.

Expected behaviour:

• successful login and calendars list

Actual behaviour:

• 405 error, no calendars shown

See attached error log
report cal err.log

Corresponding server log is simply:

[negroni] 2021-11-20T15:07:47Z | 405 | 	 207.595185ms | 192.168.1.108:8888 | REPORT /cal/martin/