How to fix "document's transparency blend space or destination color space" adobe PDF export

You wrote this is about InDesign and Illustrator. That is an InDesign error message. Can you please tell us what exactly you did in your document? Which kind of documents you used, which color modes? And what youz exported. Also: With visual effects created by transparency some PDF readers have issues. Only Acrobat can show them. Are you using Acrobat on your phone?

in the future, to find the best place to post your message, use the list here, https://community.adobe.com/

p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post if it helps you get responses.

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When you post a question you always need to tell the Adobe program you are using
There are MANY programs in a full subscription, plus other non-subscription programs
Please post the exact name of the Adobe program you use so a Moderator may move this message to that forum