Please take a look at a similar question at https://learn.microsoft.com/en-us/answers/questions/487582/is-there-a-way-to-emable-tls-10-andor-12-on-edge-c.html (answered by Yu Zhou-MSFT)
As the doc describes, TLS 1.0/1.1 will remain disabled by default in Microsoft Edge version 84 and later. If you want to enable them manually, you can refer to the following steps:
Open Edge and navigate to edge://flags/.
Type TLS in the search bar.
Change the value of Enforce deprecation of legacy TLS versions to Disabled.
Restart Edge.After finishing the above steps, when you visit https://browserleaks.com/ssl again in Edge, it will show TLS 1.0 and TLS 1.1 enabled.
Please recheck edge://flags for the settings above.
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