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I was able to finally get this working. Initially, within **Trezor Suite** I copied my „**Public key (XPUB)**“ into „**BTCPayServer**“ when I was setting up my wallet. However, I noticed in „**BTCPayServer**“ under the „**Master fingerprint**“ and „**Account key path**“ textboxes it was empty/blank and not saving any information.
I then replaced my „**BTCPayServer**“ wallet and followed the steps/instructions in the link below and when I did this I noticed that the „**Master fingerprint**“ and „**Account key path**“ textboxes populated correctly.
[https://docs.btcpayserver.org/HardwareWalletIntegration/](https://docs.btcpayserver.org/HardwareWalletIntegration/)
I then tried sending a payout by signing using „**BTCPayServer Vault**“ with my „**Trezor**“ device and it was successfully signed and broadcasted through „**BTCPayServer**“.
Just posting this just in case someone else runs into this issue!