Hello Tim_DeSpain,
Thanks for that info and choosing the Apple Support Communities. If I understand correctly, you are unable to download an item from the App Store on your iPhone, but you're able to download it on your other devices. I would start by restarting your iPhone as the shut down and start up process is important to keep the iOS software running properly. Never underestimate the power of a good restart. Also, if you haven't tried already, you can download the app to iTunes on a computer and then sync the app to your iPhone. If your issue is still not resolved, check out the help tips from Apple for issues like yours.
If you see a message that says, "This device is associated with another Apple ID. You cannot associate this device with another Apple ID for [number] days," you might need to wait to download your purchases. Learn more about associated devices.
Check to see if the purchases you're looking for are hidden. If your purchases are hidden, you might not see them even after you follow the steps below. Learn how to unhide purchases.
See if the content is available for redownload. Previously purchased items might not be available if they're no longer on the iTunes Store. Also, make sure that you’re in a country where you can redownload items. If you changed your Apple ID from one country to another, you can’t download items you purchased in a previous country.
Some of your purchases might be in a queue to download. Learn how to check for available downloads. You can have all purchases automatically download to a device or your computer if you turn on automatic downloads.
If your download was interrupted, learn how to resume the download.
If you can't find the item that you purchased in the iTunes Store, report a problem with the item. You can report a problem with a purchase made within the last 90 days. If you have a problem with an older purchase, contact iTunes Store support.
After you download your purchases, back up your iTunes library. Previous purchases might be unavailable if they've been refunded or aren't on the iTunes Store.
Download your past purchases
Restart your iPhone, iPad, or iPod touch
Cheers!