What the symptom can mean
Some combinations of programme and options are not available on every model. A control fault remains possible where the usual supported selection has changed, but compatibility should be established first.
Record the control sequence
Give the wash programme, any options already selected and the response when drying is chosen. Copy a rejected-setting message or lock indication. Mention if the selection came from an app or the machine itself.
Compare an ordinary alternative
If another programme already offered the option, include its name. Use the correct model instructions when checking available combinations rather than assuming every wash programme has identical drying choices.