The order of commands is critical when teaching the hall nodes. Some of the manuals are wrong. Do a TECCR, then a TECF, then a TECC. Pause and pay attention though after the TECF. Does it complete or fail? No need to continue if it fails. You probably have a bad HNB. Could be an open teach line but not very likely.
Oh and check the voltage on the CAN channel, should read like 2.5vdc to ground on the high and slightly less, like 2.4 on the low and visibily fluctuating. If it’s off it could be the CPUA.