Edit: Resolved! The ISP added a BS suffix ".net" to my username, deleting it fixed the Auth issue.

Hi guys!

I'm having trouble migrating from TP-Link A7 v5 stock firmware to OpenWRT.

Specifically I'm having trouble connecting to my ISP via PPPoE.
Before the migration - the router connected w/o fancy PPPoE settings (MTU,VID...) to my ISP.

Here's my network setup:

1. FTTH
2. Nokia G-010G-Q GPON
3. TP-LINK Archer A7

Before migration - I took notice the mac address under "Internet" section in
"Status" tab under "Advanced" page on my router's admin web portal

Because I vaguely remember that my ISP technician paired the GPON to a MAC address

I have copied my PPPoE credentials from my ISP web portal,
and also cross reference them against the saved credentials in the TP-Link portal.

Post migration - I configured my WAN interface to use PPPoE , entered my credentials,
made sure that the WAN MAC address is the same as before,
and all I'm getting is AUTH_TOPEER_FAILED

I've exported my /etc/config/network here

I've also exported the output of logread -f | grep ppp here

After several trial and errors - I have given up and tried to use TFTP method to revert the
firmware back to to the TP-LINK stock firmware, also w/o much success
I used a Windows machine running tftpd64 , downloaded the latest firmware from here
renamed the file to "ArcherC7v5_tp_recovery.bin"
placed the file in tftpd64 server directory ("C:\Program Files\Tftpd64")
changed my LAN settings to 192.168.0.66 / 255.255.255.0 / 192.168.0.1
and performed the recovery boot steps.
I watched the logs of tftpd64 being filled with the download attempt,
watched it succeeds , watched the router quickly flashing the power LED,
but no matter how many times I attempted this - the router goes back to load OpenWRT.

Can someone help me either revert back to the stock firmware or help me fix my PPPoE settings?