Type 1 Fonts
Preflight has the ability to flag Type 1 fonts. This is a great way to see if you are using fonts in a document that will not be supported in the future. The problem is there are OpenType Type 1 fonts and PostScript Type 1 fonts. In Preflight, when you click on Type 1 fonts not allowed, it also flags OpenType Type 1 fonts.
Would be very important to identify exactly what fonts will not be supported in the future.

We’re reviewing this issue.
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InDesign team
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Thurid Wadewitz commented
Stephanie Pullyblank: Yes, I have the same problem.
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Stephanie Pullyblank commented
I am receiving the blue pop up about Type 1 fonts, but when I open Find/Replace Fonts it says there are zero Type 1 fonts.
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Bebez commented
Indesign continues to warn that documents contain Postscript Type 1 fonts, while they are not present. Document contains Opentype Type 1 fonts.
Indesign 17.0.1
MacOs 10.15.7 -
AfC commented
I deleted or deactivate all Type 1 fonts in my system (unless essential). In my ID 17.0 documents I only use OTF or TT fonts, yet I InDesign keeps warning me about Type1 Fonts through a blue pop up. However, when I open the Find/Replace font panel, I get a "0 Type 1" fonts readout. So, what gives? I appreciate how the ID Team is trying to be helpful but helpful+confusing=confusing.