TLS Issues: Many websites now use TLS 1.2 or 1.3, which Lion’s built-in tools don’t support. This may make it difficult to activate Office 2011 over the internet. You may need to use the "Telephone Activation" option if it is still available. Key Takeaway
The final version of Microsoft Office compatible with Mac OS X Lion is (version 14.7.7). microsoft office for mac os x lion 1075 2021
Since Microsoft discontinued support in 2017 and stopped selling licenses, you must: TLS Issues: Many websites now use TLS 1