The Ignition Switch is at the bottom of the Steering Colum Lock.

Since your Key Tumbler is working and you can turn it into the proper position to remove the whole steering Colum lock which is held in by one bolt a pin you need to depress you are best off removing the whole thing.

The reason is the innards of the Steering Colum lock need to be inspected. I found mine was broken in 2 places and the Ignition Switch itself also needed replacing (it had a badly burned contact point). At the time I did it a new steering Colum lock came with a new Ignition Switch and a new Vacuum Switch that screws into the steering Colum lock.

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84 300D, 82 Volvo 244Gl Diesel