A managed solution cannot overwrite the SavedQuery component with Id=xxxx-xxx-xxx-xxx-xxxx.. Error
Are you getting below error when trying to import managed solution exported from your dev environment.
A managed solution cannot overwrite the SavedQuery component with Id=xxxx-xxx-xxx-xxx-xxxx which has an unmanaged base instance.The most likely scenario for this error is that an unmanaged solution has installed a new unmanaged SavedQuery component on the target system, and now a managed solution from the same publisher is trying to install that same SavedQuery component as managed. This will cause an invalid layering of solutions on the target system and is not allowed.
In order to fix this issue, you need to go to your source CRM org and perform the following steps:
- Open your Dev envornment.
- Navigate to Activity Feeds Configuration under Setting->System ->Activity Feeds Configurations.
- Delete all configuration records except for user entity.
- Delete user entity record.
Now you can export your solution, make sure to click on “Publish All Customization” during export step.
Power Platform Pulse 
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If you have any suggestions, please let me know.
Cheers!