As per the issue description mentioned above, you are unable to use send option, is that correct?
Could you let us know dot version of Acrobat or Reader and the operating system installed on the machine? You may refer to the steps given in this link on how to check the version: Identify the product and its version for Acrobat and Reader DC
Also, try the troubleshooting steps given in this help document: Can't connect to Adobe.com online service
Let us know if you need any help.
Adobe Acrobat X version 10.1.16
macOS High Sierra 10.13.5
Bruce F. Bradley
Castleton Holdings, LLC
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Thanks for the info. You may try resetting preferences for Acrobat using the steps given in the following link. rebooting the machine and check: How to reset Acrobat Preference settings to default.
Problems are to be expected as Acrobat X is not compatible with Mac OS High Sierra 10.13