Re: "Serious Mac Appstore problem - again.
More serious Appstore problems."
Thank you for your post to the Apple Community!
If you have two Apple accounts it can cause difficulties.
It seems from your post that you may have one Apple Account on the Mac, and one Apple Account on the iPhone ?
If the accounts meet Apple's conditions: You might consider consolidating the two accounts to save encountering difficulties: See how to:
Migrate purchases from one Apple Account to another Apple Account Migrate purchases from one Apple Account to another Apple Account - Apple Support
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Re: "Please Apple can you sort this out because it is starting to affect my business."
As we are all Apple users, just as you are, in this user-to-user community, Apple is unlikely to see your request here.
No-one here has access to your accounts or details to help sort this out for you.
Your Apple Account is generally the one account you use to access Apple services like the App Store, Apple Music, iCloud, iMessage, FaceTime, and more. It includes the email address and password you use to sign in as well as the contact, payment, and security details you use across Apple services.
You can check your Apple Account details used in the App Store are correct via:
(1) On Mac: Apple menu > System Settings > [ your name ]
(2) On iPhone: Settings > [ your name ]
(3) In your Apple Account online: https://account.apple.com/
(If needed: you can see how to:
Get a verification code and sign in with two-factor authentication - Apple Support)
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Re: "This is a known issue of course but there doesn't seem to be a fix?"
Known to whom ? Which hardware models and OS software versions are affected ?
If action from Apple is expected, Apple likely has to receive feedback from those affected in order to act. The more feedback Apple receives on an issue, the more likely the issue will be addressed in an update.
Apple's Feedback website: Product Feedback - Apple
or
For Apple Support phone numbers around-the-world:
In the article below: Scroll to "Connect with live support" to choose your country.
Contact Apple Support - Apple Support
or
Apple Support's app:
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A possibility ?
"How to manually update apps from the App Store - Apple Support
Eg: says:
How to manually update apps on your Mac
- Open the App Store.
- In the sidebar, click Updates.
- Click Update next to an app to update only that app, or click Update All.
If you didn’t get the app from the App Store on your Mac, contact the app developer to get help with updates.
Learn what to do if you can't update an app on your Mac"