Missing Pinterest and Canvas widgets on iPhone and Mac after iOS 26 update

Hello, I just updated my phone to IOS 26. When it reloaded, all of the widgets I had from Pinterest and Canvas had disappeared on both my iPhone and Macbook. I was able to put them back on my phone. On my mac, I no longer have the option to add widgets from Pinterest and Canvas, and also a number of other apps. Does anyone know a solution to this? Thanks!

[Re-Titled by Moderator]

Original Title: Missing Widgets After Updating