The calendar is a theme app block. Check that it has been added to the product template you are actually viewing, that you are on the published theme rather than a preview, and that it was re-added after any theme change, since app blocks do not carry across when a theme is duplicated or replaced. Also confirm the product has been set up as a rental product in the app: a product the app does not know about has no dates to draw.
Check these in order
The block is on this product's template.
In Online Store → Themes → Customize, open the template this product uses and look for the Miko Rental Calendar block. Products can use different templates.You are looking at the published theme.
A block added to an unpublished theme or a preview only shows there.The block survived the last theme change.
After switching or updating your theme, add the block again.The product is active in the app.
In Rental Products, the product must be listed and set to Active. In the Theme Editor, a product that is not set up shows a message saying it is not configured as a rental yet.
How to fix it
Add the block by following The date picker block, and activate the product in Rental Products. If the product is active and the block is in place but the calendar still does not show, click Sync with storefront on the Rental Products page to re-send the rental flag to your products, then hard refresh the product page.
If it still is not working
Send us the details listed in Still stuck, with the product page address, and we will check it.
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