Any ideas on why my Mac mini will send but not receive any Airdrop items?

That linked article above says (for Mac):

"If you can't see the other device in AirDrop

Make sure that both devices are within 30 feet (9 meters) of each other and have Wi-Fi and Bluetooth turned on.

Choose Go > AirDrop from the menu bar in the Finder, then check the ”Allow me to be discovered by” setting in the AirDrop window"

There is more info. in the article if needed.

Hi Energy_Steven

welcome to the Apple (user-to-user) Community!

Apple support's article (link below)has info on receiving Airdrop on Mac.

To troubleshoot:

Eg: scroll to:

"Receive content with AirDrop"

and to:

"If you can't see the other device in AirDrop"

to check out what to do.

Use AirDrop on your Mac - Apple Support

All the best :-)

So it could be that the iPhone can not send ?

You might want to check through "Before you begin" in the article below:

(ie: to see if all requirements are being met)

How to use AirDrop on your iPhone or iPad - Apple Support

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Re: Could it be a hardware issue?

Sorry, I do not know ... if you want to check for hardware issues on the Mac mini,

you could: Use Apple Diagnostics to test your Mac - Apple Support

First, you might want to "Restart" your iPhone, and your Mac mini. (Apple menu > Restart) When things are not working right, restarting will often clear the way, and put things in order.

You might want to check that you have listed yourself in "Contacts" in both the phone and the MacMini, at that seems to be a requirement.

There's also some (non-Apple) trouble-shooting articles (like the one below) online.

https://www.imymac.com/powermymac/airdrop-not-working-on-mac.html

You might want to contact (online chat, phone, eMail etc.) Mac mini Support:

There's a "Get Support" link at the bottom of their webpage below:

Mac mini - Official Apple Support

Thank you for running diagnostics .. great there are no issues there.

Re: "take it to an Apple Store and see if they can find something".

Seems they troubleshoot hardware issues by appointment:

Genius Bar Reservation and Apple Support Options - Apple

my problem is the other way around; iPhone/Ipad 'see' and send items to the mac mini, but the mac does not list any device at all