But the biggest issue is not being signed into both this account and my own at the same time.

Why are you entering a hospitality business to automate your (im)personal responses when guests have an issue?

It also allows the manager to work directly with the insurance company to resolve issues efficiently.In Texas, this is part of the standard Texas Board of Realtors Property Management Agreement and is considered an industry best practice.

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

This issue, while easy to solve, only came up at the end of the process.

Some people love the larger companies and some people prefer the smaller ones.  

Current status is that the Dept of Health has not yet issued the Septic Permit yet.

Do you think this issue is specific to banking services or what do you think is the root cause?

There might be larger buildings available but I don’t follow that market too much through the MLS, only some NH Landlord Facebook groups which are both owner friendly and agent friendly.

The other non-math issues I'm good handling myself.