Tableau is not backward compatible .
This is applicable for both Desktop and Server .
Workbooks created in newer version would not open in previous version of the software. Also, same way it will not be able to publish to prior version of the server .
You might need to recreate everything, or you can upgrade your server .
Major and minor releases Workbook Compatibility after Upgrading
Tableau Desktop
Workbooks and extracts that are saved in a later version of Desktop
are upgraded and cannot be opened by any earlier versions. Exception:
A version 8.3 workbook can be opened in Desktop 8.2. For example, a
version 9.1 workbook is upgraded when saved in Desktop 9.2. The
workbook can no longer be opened by Desktop 9.1. Workbooks and
extracts that are opened but not saved in a later version of Desktop
remain accessible by the earlier versions they were created with.
Workbooks created with the latest version of Desktop can connect to
earlier versions of Server beginning with Server 8.0. For example, a
workbook in Desktop 9.2 can connect to Tableau Server 8.2 or 8.3.
However, a workbook in Desktop 8.1 cannot connect to Tableau Server
7.0. Workbooks created in a later version of Tableau Desktop cannot be published to earlier versions of Tableau Server. Exception: Workbooks
created with Desktop 8.3 can be published to Tableau Server 8.2. For
example, workbooks created in Desktop 9.2 cannot be published to
Tableau Server 9.1. Workbooks and data sources downloaded from earlier
versions of Tableau Server can be opened by the latest version of
Desktop.
Official Doc here