Mybe is useful for others...
Validation and Repair Tools write a Log in this path C:\Users\XXXXXXUSER-O\AppData\Local\Temp (or subfolder) named "PortalforArcGIS1091ValidationAndRepair.log"
With this I see that process is in standby at 3-6-2024 22:19:27.
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Portal for ArcGIS 10.9.1 Validation and Repair Log
DATE=3-6-2024
TIME=22:19:02
Log File Location=C:\Users\XXXXXXUSER-O\AppData\Local\Temp\PortalforArcGIS1091ValidationAndRepair.log
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3-6-2024 22:19:02 (IS) CheckCommandLine - Begin
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3-6-2024 22:19:02 (IS) Command Line(s): - NONE
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3-6-2024 22:19:02 (IS) CheckCommandLine - End
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3-6-2024 22:19:03 (IS) VerifyPortalVersionInstalled - Begin
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3-6-2024 22:19:03 (IS) VerifyPortalVersionInstalled - Installed: Portal for ArcGIS 10.9.1
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3-6-2024 22:19:03 (IS) VerifyPortalVersionInstalled - End
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3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - Begin
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3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - Portal for ArcGIS 10.9.1 Enterprise Sites Security Patch is ****INSTALLED****
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - PFA-1091-HF-000006081 is Not Installed
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - PFA-1091-HF-000006002 is Not Installed
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - PFA-1091-HF-000006079 is Not Installed
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - PFA-1091-HF-000005984 is Not Installed
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - Portal for ArcGIS Security 2023 Update 1 Patch B is ****INSTALLED****
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - Portal for ArcGIS Security 2023 Update 1 Patch is Not Installed
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - PFA-1091-HF-000005869 is Not Installed
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - Portal for ArcGIS 10.9.1 Enterprise Sites Footer Display Patch is ****INSTALLED****
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - Portal for ArcGIS Security 2022 Update 2 Patch B is ****INSTALLED****
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - Portal for ArcGIS Security 2022 Update 2 Patch is Not Installed
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - PFA-1091-HF-000005867 is Not Installed
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - Portal for ArcGIS 10.9.1 QuickCapture Security Patch is ****INSTALLED****
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - PFA-1091-HF-000005774 is Not Installed
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - Portal for ArcGIS Security 2022 Update 1 Patch is ****INSTALLED****
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - Portal for ArcGIS Log4j Patch B is ****INSTALLED****
3-6-2024 22:19:14 (IS) GetListOfInstalledPatchesAndHotfixes - Portal for ArcGIS Log4j Patch is Not Installed
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3-6-2024 22:19:27 (IS) GetListOfInstalledPatchesAndHotfixes - End
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3-6-2024 22:19:27 (IS) RemoveInstalledPatchesAndHotfixes - Begin
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3-6-2024 22:19:27 (IS) CreateInProgressRegistry - Begin
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3-6-2024 22:19:27 (IS) CreateInProgressRegistry - Created RegKey: HKLM\SOFTWARE\ESRI\Portal for ArcGIS\Updates\_10.9.1.999
3-6-2024 22:19:27 (IS) CreateInProgressRegistry - Created Reg Key Name with value: InProgress=1
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3-6-2024 22:19:27 (IS) CreateInProgressRegistry - End
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3-6-2024 22:19:27 (IS) RemoveInstalledPatchesAndHotfixes - Portal for ArcGIS 10.9.1 Enterprise Sites Security Patch will be uninstalled.