Not at all!
HB tier 1 support say it's in Bridge mode. But under the TP link it says PPoE which they say is normal!!!
I have a friend with with HB and he says he cant even access the TP link router as it's been downgraded to a node basically. So something not right.
It wouldn't be the first time a first or second line support are poorly briefed/trained/unaware of some configuration details especially if its not a mainstream option.
If they are remotely putting their device into a bridge mode, then it stands to reason that you should not effectively be able to locally login to it - it becomes much like an ONT which is transparent to the end user, and effectively a fibre modem. Your own router would then need to handle the PPPoE session to establish connectivity back to the H!B network, etc etc. Just check they haven't missed giving you a step, like power down/power cycling the device or something silly like that.
Keep at them. Good luck.