Unable to Answer call without pressing Line 1

[TheKirbyGroup]

Hello Forum!

I was hoping someone could help.
It feels like it could be a simple solution to my issue

Every incoming or outgoing call you make, You have to press Line 1 before it lets you answer it or make a call.
They want it so Account 1 is the default so you don't have to press Line 1.

There are 2 registered accounts
Account 1 is their SIP
Account 2 is their 3rd party Voicemail, they have to dial it to be able to listen to voicemails.

If I disable Account 2, then the phone works as it should

So I think Account 2 is acting as an active account.
How do I set it so Account 1 is the default one?

Thanks!