My old videos not available

I am not able to find old videos for which I had preserved links. Please help where I can find them. These are my videos 

https://msit.microsoftstream.com/video/0863a1ff-0400-85a8-5706-f1eb7b4b681b 

  

https://msit.microsoftstream.com/video/63d50840-98dc-b561-d2a4-f1ebf5dbdf24 

  

https://msit.microsoftstream.com/video/960fa1ff-0400-85a8-c77d-f1eb71239e2e 

  

https://msit.microsoftstream.com/video/9d0fa4ff-0400-9887-5d4d-f1eb5b12a73f