Two or more consecutive slashes in a hyperlink are changed to one slash
When you save a hyperlink that contains two or more consecutive forward slashes (/) in Microsoft Word or Microsoft Outlook, the group of slashes is changed to a single forward slash. Therefore, the hyperlink is no longer valid.
This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, see 256986 Description of the Microsoft Windows registry.
Close all Office applications.
On the Start menu, select Run, enter regedit, and then select OK.
Locate and select the following registry subkey:
In this subkey, x.0 is the Office version (16.0 = Office 2019 or Office 2016, 15.0 = Office 2013, 14.0 = Office 2010).
After you select the subkey that's specified in step 3, point to New on the Edit menu, and then select DWORD.
Enter AllowConsecutiveSlashesInUrlPathComponent, and then press Enter.
Right-click AllowConsecutiveSlashesInUrlPathComponent, and then select Modify.
In the Value data box, enter 1, and then select OK.
On the File menu, select Exit to exit Registry Editor.