There is no trace wire on the board - You will need to bridge the 3v3 connection to the + terminal on the battery - this has worked for me - I have the same issues - Ignore the comments regarding power draw and start up there is no continuity between the + terminal and the + side of the board…
(this is not a great fix btw but will work - the charging module will have to work slightly harder in this case)
This is pretty poor show on behalf of XIAO - unless they can send some code that shows other wise…
Just to confirm I have one other board where this is not required and a standard bank code works just fine…