Same issue here. My Airbnb has stoney in the title and I can't set it as the welcome message. Very strange.
Hi, @ahol
Thanks for reaching out.
You can customize the message on the Guest mode Welcome screen.
Here's how you can edit it...
By default, your guests will be greeted on the TV with the message "Welcome! Enjoy your stay."
Use the following instructions to customize the Guest Mode welcome screen.
For more details, visit this support article at How to turn Guest Mode on and off on your Roku streaming device
Hope this helps.
Thanks,
Roku Community Team
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In the meantime, for additional assistance, visit our Support Site.
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For support, visit support.roku.com.