Wdac Error: Unable to save due to invalid data. Update your data then try again: Exception has been thrown by the target of an invocation.

[LadeleAjao]

Description:
I have been experiencing persistent issues deploying a Windows Defender Application Control (WDAC) baseline policy through Intune.
Steps Taken:
Created a WDAC baseline policy in XML.
Converted it to .p7b and signed it using a valid code signing certificate.
Followed Microsoft’s documented process to deploy via Intune Custom CSP Profile:
Devices → Configuration profiles → Create → Windows 10 and later → Templates → Custom
Add setting:
Name: WDAC Baseline
OMA-URI: ./Vendor/MSFT/ApplicationControl/Policies/1233445-9912-43c8-9b2c-12345677/Policy
Data type: Base64 (file)
Value: Uploaded {GUID}.bin file (not pasted text)
Issue:
Whenever I attempt to save and deploy, I receive the following error message:
Unable to save due to invalid data. Update your data then try again:
Exception has been thrown by the target of an invocation.

Request for Support:
Please confirm whether a signed .p7b can be directly uploaded for CSP deployment, or if only a .bin/.cip file generated by ConvertFrom-CIPolicy is supported.
Clarify if there are size limitations on the Base64-encoded policy file for Intune CSP deployment.
Provde guidance on resolving the invalid data error when uploading the signed policy.