Clicking "Enable SEO" from my-plan in wp-admin takes me to Calypso error

[gravityrail]

Steps to reproduce the issue

1. On a site with Jetpack Professional, go to /wp-admin/admin.php?page=jetpack#/my-plan
2. Click on 'Configure site SEO' under SEO Tools
3. See error "This page is only available to Jetpack sites running version 3.4 or higher with the Sharing module activated."
4. But the SEO tools are actually there on the page (though not scrolled into view)

What I expected

To see SEO tools (scrolled to those settings), perhaps a tour, some notification on how to enable them, or that they are enabled, etc.

What happened instead

Confusing error

Screenshots

[jeherve]

I'll transfer this issue to the wp-calypso repo, where that page lives.

[julsyd]

Noting this also happens with JP Premium plans. One example in 2262356-zen.

[stale]

This issue has been marked as stale and will be closed in seven days. This happened because:

• It has been inactive in the past 9 months.
• It isn't a project or a milestone, and hasn’t been labeled `[Pri] Blocker`, `[Pri] High`, `[Status] Keep Open`, or `OSS Citizen`.

You can keep the issue open by adding a comment. If you do, please provide additional context and explain why you’d like it to remain open. You can also close the issue yourself — if you do, please add a brief explanation.