A1430 i pad for MS teams

Model A1430 = iPad3

Microsoft Teams requires iOS11 or later. iPad3 can only be updated to iOS 9.3.5 (WiFi Only models) or iOS 9.3.6 (WiFi & Cellular models).

Apple ended update support for these models in September 2016. Your iPad cannot be updated to iOS 10 or later major versions of iOS, as the internal hardware does not meet the minimum technical requirements for new versions of iOS/iPadOS. This limitation cannot be bypassed; these are 32-bit architecture devices, whilst all recent versions of iOS/iPadOS are designed for 64-bit hardware platforms. iPad3 is obsolete.

You may wish to consider that compatible Apps for your iPad are increasingly difficult to find - as third-party developers are increasingly dropping support for older versions of iOS preceding iOS11/12/13, which may severely limit the usefulness and utility of your iPad. As such, if you need to access current Apps that require a more recent version of iOS than your iPad can support, you’ll need to consider replacement of your iPad with a newer or current model.

Of current models, even the entry-level iPad8 has specifications and capabilities that will massively outperform you current iPad - and is compatible with the vast majority of current Apps. Other models are more powerful still.

I hope this information provides helpful and succinct clarity as to your available options - and the limitations of your current iPad.

you can't teams require ios11 or newer ‎Microsoft Teams on the App Store (apple.com)

a1430 (ipad 3g) support top 9.3.6 iPad (3rd generation) - Wikipedia