Were these older Mojang accounts, or did you already migrate these accounts? If you already migrated (or never had to migrate and always used Microsoft to log in), you'll need to reach back out to Microsoft Support for help: msft.it/60199LWMN. ^FF
If you need some technical help, I'd suggest reaching out to our Tech team so they can look into that. To keep your information secure, please complete our request form at msft.it/60179LciZ so we can quickly and safely assist with your question! ^BT
Please visit our bug report site to see if the problem has already been reported: msft.it/60119LegS. You can upvote if the issue hasn't been resolved. If you think you've found a new bug, visit our help site here on how to submit a report: msft.it/60129Legs ^BT
No worries, our Realms team should be able to help! To keep your information secure, please complete our request form at msft.it/60159LX4f so we can quickly and safely assist with your question! ^BT
It sounds like there may be an issue either with the launcher or with the account logged in. So that we can investigate securely, please submit a ticket at msft.it/60179Lzwl and include an uncropped screenshot of what you're seeing in the launcher. -JL
You can respond to the automated message letting us know that you still need assistance; this action will escalate the ticket to our team for review. Let us know if you run into any issues or have any questions! ^FF
If you already migrated, you'll need to log in with your Microsoft account info. If you didn't migrate before Sept 19th, Support is unable to assist with Mojang account recoveries. That said, check our FAQ for more info on accessing Minecraft: msft.it/60199L1gL. ^FF
For reports of this nature, we will need you to file a ticket: msft.it/60129L1BQ. The category you choose should be Technical Support, and choose any of the other sub-category drop downs. Once we receive your ticket, we'll make sure it gets to the right place! ^FF
Let's have our team take a look at that. To keep your information secure, please complete our request form at msft.it/60189IAJ8 so we can quickly and safely assist with your question! ^BT
If you need help with the Microsoft account that's linked, you'd have to reach out to Xbox. For assistance with your Microsoft account, please reach out to Microsoft Support at msft.it/60129Ifqi on Twitter, or through their help site directly: msft.it/60139Ifqc ^BT
If you believe you meet the criteria to receive the vanilla cape but have not done so, please submit a ticket so that we can look into your account's status. Complete our request form at msft.it/60189Il40 so we can quickly and safely assist with your question! -JL
If you're running into issues with downloading, I'd suggest reaching out to our support team. To keep your information secure, please complete our request form at msft.it/60149IgrE so we can quickly and safely assist with your question! ^BT
You'd have to reach out to Microsoft Support about that. For assistance with your Microsoft account, please reach out to Microsoft Support at msft.it/60179IgPF on Twitter, or through their help site directly: msft.it/60189IgP2 ^BT
You'll just need to update your privacy settings in order to access your content. You can see how to do that by following this link: msft.it/60129Ibk6 ^BT