I need help with this problem: When I use the fill and sign option, I get message that currently there are no form fields in this pdf
We apologize for the inconvenience caused, as per the description above, you are not able to use the Fill&Sign feature as getting an error message that currently there are no form fields in this pdf, Is that correct?
Check for any pending updates of Acrobat from help>check for updates, restart the machine after installing the updates and see if this brings any difference.
The error is generally related to the type of form you are signing in. Try signing the PDF through the URL https://cloud.acrobat.com/fillsign and see if the error message pops up.
You may also refer to the following KB article and Adobe discussion and try the suggestions Fix the common issues in fillable forms in Acrobat or Reader
Have you tried signing any other PDF? Is it specific to one PDF file? If it is specific to one PDF file, Is it possible to share the PDF file with us?
To share the file, please use Adobe Send feature, upload the file, share the link to files via private message only, How Do I Send Private Message
Let us know how it goes and share your findings.