Here’s how to get closed captioning working again on a Roku.
Try these troubleshooting tips in the following order to address the issue.
confirm the Roku’s closed captioning setting is toggled on fromSettings>Accessibility>Captions mode.

YouTube subtitle options.
It seems obvious, but they might have been turned off without you realizing it.
If they already are, shut them off, reboot the Roku, and then turn them back on.
Don’t skip over this step.

YouTube subtitle options.
Do this throughSettings>System>System restart>Restart.
Verify the caption styles.
see to it they aren’t customized to the point they aren’t showing up correctly.

They may be working just fine, but you might’t see them very well.
Use the app’s built-in closed captioning control if it has one.
go for the captions button and choose an option from that menu, such asEnglish (auto-generated).
One example of an option there isEnglish [Original] with Subtitles.
Use the mobile app’s captioning button, if possible.
Streaming services like Netflix and YouTube have mobile apps to cast video to the TV via the Roku.
Playback and subtitle control are available directly from the app when you do this.
Like the previous step, try casting from the service’s desktop site.
Check for a Roku update.
A bug could be to blame, and the only way to fix that is through a system update.
An individual app could also be the culprit.
How Do I Activate Closed Captions On Roku?
Press theHomebutton to go to the home screen.
Go toSettings>Accessibility>Captions mode.
If you don’t see Accessibility, selectCaptionsto fire up the captions menu.
From the Roku Home screen, navigate toSettings > Accessibility > Captions modeand ensure its set toOff.
Alternatively, it’s possible for you to also check the channel’s prefs.
Finally, if all this seem to be set correctly, you might always reset your gadget.
For the fastest method use the remote shortcut.
Quickly press theStarbutton four times in a row to disable/enable narration.