Is there a way to force the security portal recommendations to update?

merbatosco Unfortunately Microsoft do not advise the update intervals on the software inventory.

A post on the topic on this page seems to indicate it is every 4 hours but that is not confirmed:

https://techcommunity.microsoft.com/t5/microsoft-defender-for-endpoint/software-inventory-versions-out-of-date/m-p/506793

Also note, if you check the Software Inventory section from a Device page it will show a Software Evidence section of the software being installed, such as the install or registry path, so it may be possible the software has not been fully removed hence why Defender for Endpoint still sees it as installed.

Finally,  you can use the Remediation Request feature in the Remediation Options for the security recommendation to assign the task to a team member and track it that way.