According to my research, the methods below might be helpful to this issue, you could take a try:
1. Change ‘PSTDisableGrow’ Registry Key Value
Several Outlook users were able to fix the error by changing the ‘PSTDisableGrow’ registry key value from ‘1’ to ‘0’. Here’s how you can do so:
Open the Run window by clicking ‘Windows+R’ keys together, and then type regedit.
The Registry Editor window gets displayed.
Locate the ‘PSTDisableGrow’ registry key by browsing to the following location:
Note: Replace xx.0 with the Outlook version that you’re using. For example, Change xx.0 to 19.0 for Outlook version 2019, 16.0 for Outlook 2016 and Office 365, 15.0 for Outlook 2013, 14.0 for Outlook 2010 and 12.0 for Outlook 2007.
Right-click ‘PSTDisableGrow’, and click Edit.
In the Edit DWORD (32-bit) Value box, replace the Value data 1 to 0, and then click OK.
2. Change PST File Properties
Browse the location where the Outlook PST file is saved.
Right-click the Outlook data file (.pst), and then select Properties.
Click Attributes, uncheck the Read-only checkbox, and then click OK.
Now check if the error is fixed. If not, try modifying the PST file permissions. To do so, perform the following:
Right-click on the PST file again, and select Properties.
In the window that pops up, click the Security tab, and then click Edit.
Select your user account.
Check the Full control checkbox, click Apply,and then press the OK button.
Take a look at the discussion in below related threads: