In case you need further assistance with this, please share the OS version, Adobe Photoshop version that you are using and is there a specific font which is not accessible via Adobe Photoshop? When you say other programs can use fonts are those Adobe applications or any other third party applications?
Hello. I am having the same problem with PS. I am on an iMac with Big Sur version 11.6.7. My application is Photoshop 2022. The problem font is Eurostile Condensed and Extended #2. This font works fine in InDesign and Illustrator. I have a PS document that I created last year and I need to update it but it won't recognize the font. I have done all the steps mentioned in the link that you mentioned. Any other suggestions? Thanks.