Amazon announced in emails to Roku owners that, effective November 1, 2021, their Prime Video will no longer support a number of older Roku models.
The model numbers affected are:
Roku 2 HD/XD/XS models 2050X, 2500X, 2720X, 3000X, 3100X
Roku LT models 2400X, 2450X, 2700X
Roku SE model 2710X
Roku Streaming Stick models 3400X, 3420X, 3500X
(The Xs or other letters at the end of the model number are distribution codes and are irrelevant for this issue.)
To check your model number use Roku menu path Settings / System / About
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