If you upgraded to mac sequoia 15.x, you need to check the permissions, I'll explain below.
It happens that the mac detects the applications again, uninstall one of them, right-clicking on it and selecting move to trash. then go to https://app.nesplora.com/es/user/library click on the app you uninstalled, download it and install it again on your computer.
then start a test and keep an eye on the messages on the mac, press alow when it asks you.
First of all check that the firewall is disabled:
Restart your Mac, reopen the Nesplora app you want and start an assessment to get the headset to connect. At that point, this message appears:
Click on "Allow"
To authorize the connection of the Nesplora applications to the headset in macOS Sequoia go to Privacy & Security.
1.- Privacy and Security > 2.- Local Network > 3.- Activate app
The application, (for example, in the image below, Suite Control) must be activated/allowed.
You can also check and activate the nesplora apps at: