[Semi-Solved]:When Dialing out all I get is "that password is invalid" ?

[tanny]

Just recently, over the last day or two,
I hear a dial tone but when I dial out all I get is "that password is invalid" ?
It does not matter which phone number we dial to our friends, ..., all we get is "that password is invalid".?

I've changed nothing at my end, same ISP, ..., and everything was working fine for months, ... before.
Also, on my https://www.freephoneline.ca/showSipSettings , I see "SIP Status: disconnected" ?

Any ideas?
Hardware:
Grandstream HT802-v2
ALSO, my credit balance is fine.

[tanny]

Previous Settings HT802-v2 (which had worked fine for months...):
(Under Port Settings -> FXS PORT1)
Primary SIP Server: voip.freephoneline.ca
Failover SIP Server: voip2.freephoneline.ca
Prefer Primary SIP Server: Will Register to Primary Server if Failover registration expires.
SIP User ID: <my phone number>
SIP Authenticate ID:
I rebooted the system and it still failed to register, so obviously, the "Failover" had failed.!

So then I changed the settings of my HT802-v2 to the below, just now:
New Settings (since freephoneline voip server were failing...):
(Under Port Settings -> FXS PORT1)
Primary SIP Server: voip2.freephoneline.ca
Failover SIP Server:
Prefer Primary SIP Server: No
SIP User ID: <my phone number>
SIP Authenticate ID: <my phone number>

I rebooted, and now according to my https://www.freephoneline.ca/showSipSettings , everything connects fine again.
"SIP Status: connected"
"SIP User Agen: Grandstream HT802V2 1.0.9.3"
...and now I can successfully dial out again.

I must admit,
that when I had used my old Cisco/Linksys SPA2102 VoIP/ATA, for over 16 years with freephoneline, I never experienced the amount of issues compared with this HT802-v2 and/or freephoneline -for the last year?.

Maybe this is just some recent freephoneline voip server burps?, or maybe fongo just wants us all to pay more for their stuff?, or maybe the HT802-v2 is an immensely over-complicated Voip/ATA that no one can seem to explain the recommended settings?.
In fact, regarding the HT802-v2, the wording for most (help) settings seems to be in reverse polish-logic, or chinese translations, ...?
I dunno.