Sorry , We Can't Connect to the sharepoint store

Question

I need Help about this issue , i have four day trying to fix the problem. Note: I have the catalog app, the DNS and the necessary subscriptions that SharePoint in the Central Administration Portal on SharePoint.

I wait your comments .

Answer 1

Please check below.

• Make Sure the Root Certificate Added into trusted Root Chain.
• Make Sure the internet access to the Store feature ACTIVATED
• Make sure your app domain works fine.
• Make sure App Management Service and Microsoft SharePoint Foundation Subscription Settings Service is started on your server.
• Make sure App Management Service Application and Microsoft SharePoint Foundation Subscription Settings Service Application is started.
• Check the detail error message of ULS log to determine the exact cause of the error.

Answer 2

Microsoft help had me do the following to resolved the issue.

https://docs.microsoft.com/en-us/sharepoint/security-for-sharepoint-server/enable-tls-1-1-and-tls-1-2-support-in-sharepoint-server-2016#enablestrongcrypto4.5

Answer 3

Adding the reg key net46-strong-crypto-enable.reg with

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319]
"SchUseStrongCrypto"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v4.0.30319]
"SchUseStrongCrypto"=dword:00000001

and then a reboot fixed it for me