Rejected because extension not found in context 'local-office-extension'

Asterisk Asterisk Dialplan
2

exten => 1002,n,Dial(PJSIP/1002)

That line should be:

exten => 1002,1,Dial(PJSIP/1002)

Also, I suspect you are making life more complex / difficult / confusing for
yourself by configuring both chan_sip and chan_pjsip.

chan_sip is deprecated and unmaintained. Stop using it (especially for a
new setup) and use chan_pjsip instead.

Antony.