Sorry for the delay in response.
Usually, this happens if the fonts are not embedded into a file. You may try to embed the fonts in the file Embedding Fonts with Acrobat Pro's Preflight Tool - KHKonsulting LLC https://acrobatusers.com/tutorials/how-to-embed-fonts-in-a-pdf and see if that helps.
If you have already found a solution to this issue, please update the thread with your findings that will help others.
It doesn't help, please see the file attached starting from page 4
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You cannot attach files to a forum post. You would have to upload the file you want to share to an online service like Adobe's document Cloud or Dropbox and then share the link to that upload. See here for instructions: Share Documents via Adobe's Document Cloud - KHKonsulting LLC
Here is another potential workaround for your problem: