Drying cannot be turned on via bambo studio, but it works normally from the printer. I can turn it on via the program only when I put in PLA, generic PETG is loaded in AMS HT. Is this an error or is the drying function still unavailable from bambu studio?
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I have the same issue. And Bambu states this functionality was part of the release update, the ability to dry from the app. Seems like a lack of testing for a release by BambuLabs, thus an error.
If you change it to 60º, it works. Whoever at BambuLabs built that filament temp. validation check doesn’t even know their own products, as on the printer itself it allows for 65º temp. 
I has this and opened a ticket on the Studio Github. Acknowledgedand said that it would be fixed in the next release. Filament Drying · Issue #10098 · bambulab/BambuStudio · GitHub
I’m having problems too:
Since the firmware update 31032026 for the H2S + AMS 2 Pro, the AMS simply switches off as soon as you start the drying function.
I had to revert to the old firmware to get it working again.