I believe that the OLT used in this case belong to a manufacturer which restrict compatibility with other brands.
Else,if Mac binding was the issue,it would show the auth error in the status page.
I would like to invite @vignesh_venkatesan@Realme@varkey to have their point of view for better clarification.
Yep, so it doesn't appear to be registered with the OLT. Only your cable operator who manages the OLT will be able to help.
Note that it might even just show Registered, Not authenticated, if the OLT doesn't require authentication, but in this case it looks like the ONT does require auth. Perhaps, previously it was setup to work without ONT authentication and now the LCO turned on that option.
@Kick933 The error messages differ based on whether it's EPON or GPON. In this case it's EPON which appear to show this message when ONT authentication fails.
Even if you did not make your payment,they just cut your access to internet.PON level disconnection from OLT is never used as it requires restart of OLT which is usually not preferred by LCO. @varkey
I did not know that earlier