VBA Outlook - Defining folder

[TheMadTree]

Good afternoon everyone,

Ever since I upgraded to Office 365, I keep having the same run time error in my outlook macro:
"Run-time error '-2147221233 (8004010f)':
The attempted operation failed. An object could not be found."

Now it is appearing when I am trying to assign a folder path to a variable:

Option Explicit

Dim ns              As Outlook.NameSpace
Dim MyFolder        As Outlook.Folder

Sub SelectFolder


Set ns = Application.GetNamespace("MAPI")
Set MyFolder= ns.Folders("MailboxName").Folders("Inbox").Folders("SpecificFolder")

End sub

I got the same error last week when I was assigning a specific workbook to a variable wb which was defined as 'set wb as workbook' (which ran previously multiple times without issue). I solved it by changing the way the variable was defined: 'set wb as object'.

Am I missing something? Does anybody know what is causing these errors? Or what I can do to solve them?

Thank you!