Crash: Multiple CallAgent instances with the same identity is not allowed.

> Please provide us with the following information:
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We are working with an example in .NetMaui which is also WinUI, but we are facing a problem at startup, I simulated the same problem in your example which is WinUI and it happened twice.
### This issue is for a: (mark with an `x`)
```
- [x] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
>
Sample CallingWinUI
### Any log messages given by the failure
>

The text associated with this error code could not be found.\r\n\r\nMultiple CallAgent instances with the same identity is not allowed.

### Expected/desired behavior
>

### OS and Version?
> Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)
Windows 11
### Versions
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1.5.0-beta.1, 1.4.0-beta.1, 1.3.0 and 1.4.0
### Mention any other details that might be useful

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> Thanks! We'll be in touch soon.