Hello, I found the answer at Canon, as someone had already asked there:
For the PIXMA TS9550a there is compatibility with macOS Tahoe 26 via the Apple AirPrint function.
A separate installation of a driver is not required.
All you need is the AirPrint compatible scan application from Canon, which you can obtain from the device's support page:
IJ Scan Utility Lite v.4.2.0 (Mac)
https://www.canon.de/support...Yours sincerely